chore/fix: switch release pipeline to goreleaser & ghcr.io (#40)

* chore: add goreleaser config + adapt Dockerfile

Signed-off-by: Matthias Riegler <me@xvzf.tech>

* chore: cleanup makefile and deprecated pipeline

Signed-off-by: Matthias Riegler <me@xvzf.tech>

* chore: go mod tidy -go=1.19

Signed-off-by: Matthias Riegler <me@xvzf.tech>

---------

Signed-off-by: Matthias Riegler <me@xvzf.tech>

.github/workflows/docker.yml

@@ -1,57 +0,0 @@
-# https://github.com/marketplace/actions/build-and-push-docker-images#git-context
-name: docker
-
-
-on:
-  push:
-    branches:
-      - 'master'
-    tags:
-      - 'v*'
-  pull_request:
-    branches:
-      - 'master'
-
-jobs:
-  docker:
-    runs-on: ubuntu-latest
-    steps:
-      -
-        name: Checkout
-        uses: actions/checkout@v2
-      -
-        name: Set up QEMU
-        uses: docker/setup-qemu-action@v1
-      -
-        name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v1
-      -
-        name: Docker meta
-        id: meta
-        uses: docker/metadata-action@v3
-        with:
-          images: jsonnetlibs/docsonnet
-          tags: |
-            type=ref,event=branch
-            type=ref,event=pr
-            type=semver,pattern={{version}}
-            type=semver,pattern={{major}}.{{minor}}
-      -
-        if: ${{ github.repository == 'jsonnet-libs/docsonnet' }}
-        name: Login to DockerHub
-        uses: docker/login-action@v1 
-        with:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
-      -
-        name: Build and push
-        id: docker_build
-        uses: docker/build-push-action@v2
-        with:
-          context: .
-          push: ${{ github.event_name != 'pull_request' && github.repository == 'jsonnet-libs/docsonnet' }}
-          tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}
-      -
-        name: Image digest
-        run: echo ${{ steps.docker_build.outputs.digest }}